共查询到20条相似文献,搜索用时 140 毫秒
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煤制甲醇工艺气化炉出来的合成气中含有甲烷,使后续工艺的能耗大大增加。研制的甲醇合成气分离回收LNG装置,不仅降低了合成气中甲烷含量,而且将合成气中甲烷分离液化成LNG供商业销售,创造较好的经济效益和社会效益。介绍甲烷深冷分离回收LNG技术的工艺流程特点和应用实例。 相似文献
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Peter Daimer 《深冷技术》1975,(Z2)
合成氨生产工艺中所需的氮气来自空气,因此将随着空气带入氩气。而且由于原料中甲烷的不能完个变换,或者在造气工艺中采用了甲烷化工序,而使合成原料气中增添了一些甲烷。山于氩和甲烷在合成系统中是不起反应的,所以必然会在系统中积累,因此合成系统必须经常抽出一部分驰放气。在此驰放气中除了氩和甲烷以外,很自然地将包含一定数量的氢和氮。当将此气流进行低温分离时,便可得到纯氢或合成气、高纯度的氩和甲烷,这些产品的获得将决定于装置的型式。以下介绍二种分离装置并进行一定的经济评价。 相似文献
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该发明(中国专利1240816A)是一种合成气的生产方法,是采用高产品气回收率的吸附法净化技术取代甲烷化、脱水干燥和深冷净化工艺,并将吸附净化单元再生得到的富含CH4尾气循环使用,实现尾气中甲烷的循环转化,以最大限度地降低蒸汽转化过程的原料消耗,同时可获得高品质的氢气或合成气。一种吸附法净化制取高纯合成气的方法@陈晓惠 相似文献
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A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling. 相似文献
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An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue. 相似文献
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水三相点是开尔文热力学温度的唯一基准点,也是ITS-90国际温标重要的定义固定点。因此,水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来,中国计量科学研究院研制出一系列高质量的水三相点容器,加强了水三相点的研究,为不确定度的分析提供了更为可靠的实验依据。同时,不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此,根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明,其扩展不确定度为0.16mK(k=2.69,P=0.99)。 相似文献
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